** Shares of Kaiser Reef KAU.AX fall 5.9% to A$0.16, eyeing their weakest trading session since February 28, if current trends hold

** Gold miner to buy Henty mine in Tasmania from peer Catalyst Metals CYL.AX, latter said

** Transaction terms include upfront A$15 million ($9.44 million) among others

** Catalyst shares on trading halt

** More than 1.7 million shares change hands, 5.7 times the 30-day avg

** Stock up 4.7% YTD, including current session's moves

($1 = 1.5891 Australian dollars)

(Reporting by Nikita Maria Jino in Bengaluru)

((Nikita.Jino@thomsonreuters.com;))